Why Adsense CPC is decreasing every month?


#1

My adsense CPC was $0.38 in July 2015 that is decreasing every month and it reached to $0.13 in jan 2016. My organic visits are increasing every month and reached to 1.5 times in compare to july 2015. I have tried everything in last six months but nothing works. @Mohammad Please help to improve.